Lightweight steel-concrete combined cover beam

Abstract

The utility model discloses a light steel-concrete combined bent cap which is of a steel-concrete combined structure composed of a steel shell and core filling concrete, the steel shell is of a groove body structure with an opening in the top, and a bottom plate of the steel shell is provided with an installation preformed hole used for being connected with a pier in an inserted mode. According to the utility model, the steel shell is used as a template for pouring the capping beam and also cooperates with concrete to exert performance, so that the strength and the stability of the capping beam structure are enhanced. Compared with a conventional prefabricated part, the dead weight of the cover beam is reduced to a great extent, and the construction and hoisting difficulty is lowered. After the steel shell is installed in place, concrete is directly poured, construction is convenient, the influence on the surrounding environment is reduced, and construction safety risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge structures, and particularly relates to a lightweight steel-concrete composite capping beam. Background Art

[0002] As an important part of the bridge substructure, for widely used conventional simply supported beam bridges, as the main support and force-transferring component of the superstructure, the capping beam is essential. The capping beam is generally constructed by cast-in-place with full hall formwork support, but it has a great impact on the environment, especially for higher bridges, with high construction safety risks and long construction periods. With the development of transportation, the crossing of lines is inevitable. As a common technical means for overpassing and underpassing, "overpassing" means using a bridge to cross relevant lines to reduce traffic interference. For crossing existing roads, it is crucial to ensure the existing traffic conditions and reduce the impact on the surrounding environment. For capping beams with high bridge heights, the construction risk is high, and it is difficult to use full hall formwork support for construction. If a bracket is erected on the pier for construction, its installation and removal are complex, and there are still relatively large construction risks. If a prefabricated structure is adopted, with the increase of road width, the weight of the capping beam increases rapidly. The conventional overall prefabrication scheme has high construction requirements and is difficult to be directly applied, and the sectional prefabrication scheme has high requirements for formwork conditions. Therefore, proposing a lightweight and convenient capping beam scheme is of great significance for improving the construction safety of the capping beam and accelerating the construction progress. Content of the Utility Model

[0003] The purpose of the utility model is to provide a lightweight steel-concrete composite capping beam. The steel shell not only serves as the formwork for pouring the capping beam concrete, but also participates in the force and forms a steel-concrete composite structure with the concrete. The utility model will greatly reduce the construction difficulty, construction risk and the impact on the surrounding environment of the capping beam.

[0004] The utility model is realized through the following technical solutions:

[0005] A lightweight steel-concrete composite capping beam includes a steel shell and core-filled concrete poured inside the steel shell. The steel shell has a trough structure with an open top, and installation reserved holes for inserting bridge piers are opened on the bottom plate of the steel shell. By using the steel shell as both the formwork for pouring the capping beam and collaborating with the concrete to exert performance, the structure size is reduced, and the strength and stability of the capping beam structure are enhanced. Compared with conventional prefabricated components, the self-weight of the capping beam during transportation and hoisting is greatly reduced, and the requirements for transportation and hoisting at the construction site are significantly reduced. After the steel shell is installed in place, concrete is directly poured, which is convenient for construction, reduces the impact on the surrounding environment, and greatly reduces the construction safety risk.

[0006] Further technical solutions:

[0007] It further includes a ring rib which is arranged at the installation reserved hole. The bottom end of the ring rib is connected to the bottom plate, and the top end of the ring rib extends into the groove structure of the steel shell.

[0008] Furthermore: It further includes a lateral support assembly, and both ends of the lateral support assembly are respectively supported on the inner side of the web of the steel shell.

[0009] Furthermore: The lateral support assembly includes a lateral support rod and two inclined support rods. Both ends of the lateral support rod are respectively supported on the inner side of the web of the steel shell, and the support positions are located at the top of the inner side of the web of the steel shell.

[0010] Furthermore: The two inclined support rods are symmetrically arranged with respect to the midline of the lateral support rod. One end of the inclined support rod is supported at the intersection of the inner side of the web of the steel shell and the lateral support rod, and the other end of the inclined support rod is supported at the midpoint of the bottom plate.

[0011] Furthermore: It further includes a bottom plate PBL shear key which is arranged on the bottom plate, and the bottom plate PBL shear key is arranged longitudinally along the bottom plate.

[0012] Furthermore: It further includes a bottom plate transverse stiffening rib which is perpendicularly arranged on the bottom plate with respect to the PBL shear key.

[0013] Furthermore: Multiple bottom plate PBL shear keys are evenly and equidistantly arranged on the bottom plate.

[0014] Furthermore: It further includes web PBL shear keys, and several web PBL shear keys are vertically arranged on the inner side wall of the steel shell;

[0015] Furthermore: Several web PBL shear keys are evenly and equidistantly arranged.

[0016] Furthermore: It further includes web shear studs and web tension tie bars. Several web shear studs are evenly and equidistantly arranged on the web of the steel shell, and both ends of the web tension tie bars are respectively connected to the shear studs on the webs on both sides of the steel shell.

[0017] Furthermore: It further includes a cantilever haunch. One side of the cantilever haunch is connected to the outer side of the web of the steel shell, and the other side of the cantilever haunch is connected to the flange of the top plate of the steel shell;

[0018] Furthermore: And a circular hole of the cantilever haunch is formed on the cantilever haunch.

[0019] Furthermore: The other side of the cantilever haunch is connected with a side panel, and the top of the side panel is connected to the flange of the top plate of the steel shell.

[0020] Further: an I-beam structure for supporting the bridge pier is also arranged at the installation reserved hole, the I-beam structure includes a transverse I-beam, a longitudinal I-beam and a reinforcing channel steel, the transverse I-beam and the longitudinal I-beam are arranged perpendicular to each other, and the intersection of the transverse I-beam and the longitudinal I-beam is located at the center point of the installation reserved hole, one end of the reinforcing channel steel is obliquely supported on the reinforcing transverse I-beam, and the other end of the reinforcing channel steel is obliquely supported on the longitudinal I-beam;

[0021] Furthermore: the I-beam structure and the cap beam are both provided with transverse support components at the mid-span.

[0022] Further: it also includes internal filling concrete reinforcement, the internal filling concrete reinforcement includes top transverse reinforcement, top longitudinal reinforcement, web vertical reinforcement, web longitudinal reinforcement, bottom plate transverse reinforcement, bottom plate longitudinal reinforcement and frame reinforcement, the top transverse reinforcement and top longitudinal reinforcement are staggered and arranged on the top of the steel shell;

[0023] Further: the web vertical reinforcement and web longitudinal reinforcement are arranged on the web PBL shear key, the bottom plate transverse reinforcement and bottom plate longitudinal reinforcement are arranged on the bottom plate PBL shear key, and the web vertical reinforcement, web longitudinal reinforcement, web PBL shear key, bottom plate transverse reinforcement, bottom plate longitudinal reinforcement and bottom plate PBL shear key form a whole;

[0024] Furthermore: one end of the frame reinforcement is tied to the top transverse reinforcement, and the other end is tied to the bottom plate transverse reinforcement.

[0025] Further: comprising pier connecting steel bars, the pier connecting steel bars comprising pier vertical connecting bars, pier top transverse connecting bars and pier top longitudinal connecting bars, the pier top transverse connecting bars and pier top longitudinal connecting bars are tied into a horizontal grid, the pier vertical connecting bars are vertically arranged along the axial direction of the reserved installation holes, and the pier vertical connecting bars are tied into a whole with the horizontal grid.

[0026] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0027] 1. The utility model proposes a lightweight steel-concrete composite cap beam. The steel shell is used as a template for pouring the cap beam and also bears force in coordination with concrete. The steel shell replaces the bottom longitudinal reinforcement, stirrups and bent reinforcement of the conventional cap beam. Compared with the conventional cap beam, the structural size is greatly reduced, and the mechanical properties of the steel-concrete composite structure are superior.

[0028] 2. The utility model proposes a lightweight steel-concrete composite cap beam. The steel shell and most of the steel bars can be processed in the factory, transported to the site for installation, and then directly poured with concrete, which reduces the amount of high-altitude work on site, greatly reduces the safety risk of construction, is convenient for construction, and reduces the impact on the surrounding environment. In addition, the steel shell is light in weight, which can greatly reduce the requirements for transportation and hoisting.

[0029] 3. The present utility model proposes a lightweight steel-concrete composite capping beam. The setting of the cantilever flange can increase the structural stiffness, reduce the risk of beam dropping, and provide a certain working platform during construction. Description of the Drawings

[0030] To more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0031] Figure 1 is a schematic structural diagram of the present utility model;

[0032] Figure 2 is a top view of the structure of the present utility model;

[0033] Figure 3 is a schematic diagram of the partial structure of the I-beam steel structure;

[0034] Figure 4 is Figure 1 the sectional view taken along the B-B section in

[0035] Figure 5 is Figure 1 the sectional view taken along the C-C section in

[0036] Figure 6 is Figure 1 the sectional view taken along the D-D section in

[0037] Figure 7 is Figure 2 the sectional view taken along the A-A section in

[0038] Figure 8 is a schematic diagram of the steel bar reinforcement structure of the filled concrete in the B-B section and the D-D section;

[0039] Figure 9 is a schematic diagram of the steel bar reinforcement structure of the filled concrete in the C-C section;

[0040] Figure 10 is a schematic diagram of the connecting steel bar structure of the bridge pier;

[0041] Figure 11 is Figure 9 the schematic diagram of the structure of the K-K section in

[0042] Figure 12 is Figure 9 the schematic diagram of the structure of the J-J section in

[0043] Reference signs in the drawings and corresponding component names:

[0044] 1 - Steel shell, 2 - Pier, 3 - Ring rib, 4 - Lateral support assembly, 5 - Bottom plate PBL shear key, 6 - Web PBL shear key, 7 - Cantilever haunch, 8 - Circular hole in cantilever haunch, 9 - I-shaped steel structure, 10 - Side enclosure plate, 11 - Bottom plate, 12 - Installation reserved hole, 31 - Top horizontal reinforcement, 32 - Top longitudinal reinforcement, 33 - Web vertical reinforcement, 34 - Web longitudinal reinforcement, 35 - Bottom plate horizontal reinforcement, 36 - Bottom plate longitudinal reinforcement, 37 - Bracing reinforcement, 41 - Lateral support rod, 42 - Diagonal support rod, 51 - Bottom plate lateral stiffener, 61 - Web shear stud, 62 - Web tension tie bar, 71 - Pier vertical connecting reinforcement, 72 - Pier top horizontal connecting reinforcement, 73 - Pier top longitudinal connecting reinforcement, 91 - Lateral I-beam, 92 - Longitudinal I-beam, 93 - Reinforcing channel steel. Detailed implementation manners

[0045] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with embodiments and the drawings. The illustrative embodiments and descriptions thereof of the present utility model are only used to explain the present utility model and do not limit the present utility model.

[0046] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present utility model. However, it is obvious to those of ordinary skill in the art that: these specific details do not have to be adopted to implement the present utility model. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present utility model.

[0047] Throughout the specification, the reference to "one embodiment", "embodiment", "one example" or "example" means that the specific features, structures or characteristics described in connection with that embodiment or example are included in at least one embodiment of the present utility model. Therefore, the phrases "one embodiment", "embodiment", "one example" or "example" appearing throughout the specification do not necessarily all refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in any appropriate combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0049] Embodiment:

[0050] As Figures 1 to 12 shown, a lightweight steel-concrete composite capping beam of the present utility model includes a steel outer shell 1. The steel outer shell 1 has a trough structure with an open top. An installation reserved hole 12 for inserting a bridge pier 2 is provided on the bottom plate 11 of the steel outer shell 1. In this embodiment, the steel outer shell can not only serve as a formwork for capping beam pouring, but also cooperate with concrete to exert its performance, reduce the structural size, and enhance the strength and stability of the capping beam structure. Compared with conventional precast components, the self-weight of the steel structure capping beam is greatly reduced, and the construction and hoisting difficulties are lowered. During construction, the connection between the steel outer shell 1 and the bridge pier 2 is realized through the installation reserved hole 12, and then concrete is poured into the trough structure of the steel outer shell 1 to finally form a steel-concrete composite capping beam structure. Generally speaking, the use of the steel outer shell 1 can facilitate construction, reduce the impact on the surrounding environment, and lower the construction safety risk.

[0051] It further includes a ring rib 3. The ring rib 3 is arranged at the installation reserved hole 12. The bottom end of the ring rib 3 is connected to the bottom plate 11, and the top end of the ring rib 3 extends into the trough structure of the steel outer shell 1. In this embodiment, the arrangement of the ring rib 3 can enhance the stability of the connection structure between the steel outer shell 1 and the bridge pier 2. After the bridge pier 2 is inserted into the steel outer shell 1, the ring rib 3 can reinforce the opening of the steel outer shell to improve the mechanical properties of the connection part, fix the steel outer shell on the bridge pier 2, and then carry out the pouring of the concrete structure.

[0052] It further includes a transverse support assembly 4. The two ends of the transverse support assembly 4 are respectively supported on both sides of the inner wall of the steel outer shell 1. In this embodiment, the arrangement of the transverse support assembly 4 can enhance the lateral stability of the steel outer shell 1. Specifically, the transverse support assembly 4 includes a transverse support rod 41 and two inclined support rods 42. The two ends of the transverse support rod 41 are respectively supported on the inner side of the web of the steel outer shell 1, and the support positions are located at the top of the inner side of the web of the steel outer shell 1. The two inclined support rods 42 are symmetrically arranged about the midline of the transverse support rod 41. One end of the inclined support rod 42 is supported at the intersection of the inner side of the web of the steel outer shell 1 and the transverse support rod 41, and the other end of the inclined support rod 42 is supported at the midpoint of the bottom plate 11.

[0053] It further includes a bottom plate PBL shear key 5, the bottom plate PBL shear key 5 is arranged on the bottom plate 11, and the bottom plate PBL shear key 5 is arranged along the longitudinal direction of the bottom plate 11. In this embodiment, the performance of the bottom plate is enhanced and the connection between the core-filled concrete and the steel shell is ensured by the arrangement of the bottom plate PBL shear key 5. And for ensuring safety, three bottom plate PBL shear keys 5 are arranged on the bottom plate 11, and the three bottom plate PBL shear keys 5 are evenly and equidistantly arranged on the bottom plate 11. In order to further enhance the structural stiffness, a bottom plate transverse stiffening rib 51 is arranged on the bottom plate 11, and the bottom plate transverse stiffening rib 51 is arranged on the bottom plate 11 perpendicular to the bottom plate PBL shear key 5.

[0054] It further includes web PBL shear keys 6, and a plurality of the web PBL shear keys 6 are vertically arranged on the inner side of the web of the steel shell 1; a plurality of the web PBL shear keys 6 are evenly and equidistantly arranged. Similarly, the arrangement of the web PBL shear keys 6 can effectively control the deformation of the web of the steel shell 1, improve the stiffness and stability of the web, and on the other hand, it can also ensure the connection between the core-filled concrete and the steel shell. In order to improve the cooperative working ability of the steel-concrete structure, a plurality of web shear studs 61 are evenly and equidistantly arranged on the inner side of the web of the steel shell 1, and both ends of the web tie bars 62 are respectively tied to the corresponding shear studs on the inner sides of the two webs of the steel shell 1.

[0055] It further includes a cantilever haunch 7, one side of the cantilever haunch 7 is connected to the outer side of the web of the steel shell 1, and the other side of the cantilever haunch 7 is connected to the flange of the top plate of the steel shell 1; in this embodiment, the arrangement of the cantilever haunch 7 can improve the stability of the top plate; a cantilever haunch round hole 8 is formed in the cantilever haunch 7, and the cantilever haunch round hole 8 can facilitate later maintenance, temporary construction anchoring, the setting of continuous beam devices, etc. A side enclosure plate 10 is connected to the other side of the cantilever haunch 7, and the top of the side enclosure plate 10 is connected to the flange of the top plate of the steel shell 1. In this embodiment, the addition of the side enclosure plate 10 can effectively enhance the flexural bearing capacity of the flange plate and improve the performance of the capping beam structure.

[0056] An I-shaped steel structure 9 for supporting the bridge pier 2 is further arranged at the installation reserved hole 12. The I-shaped steel structure 9 includes a transverse I-beam 91, a longitudinal I-beam 92 and a reinforcing channel steel 93. The transverse I-beam 91 and the longitudinal I-beam 92 are arranged perpendicular to each other, and the intersection point of the transverse I-beam 91 and the longitudinal I-beam 92 is located at the center point of the installation reserved hole 12. One end of the reinforcing channel steel 93 is obliquely supported on the transverse I-beam 91, and the other end of the reinforcing channel steel 93 is obliquely supported on the longitudinal I-beam 92; in this embodiment, the entire steel shell 1 is installed on the bridge pier 2 through the arrangement of the I-shaped steel structure 9.

[0057] In this embodiment, preferably, transverse support assemblies 4 are provided at the mid-span of both the I-shaped steel structure 9 and the capping beam, so that the transverse support assemblies 4 can be effectively utilized to enhance the strength and stability of the steel shell 1 structure.

[0058] It further includes internal concrete reinforcement bars. The internal concrete reinforcement bars include top transverse bars 31, top longitudinal bars 32, web vertical bars 33, web longitudinal bars 34, bottom transverse bars 35, bottom longitudinal bars 36 and erection bars 37. The top transverse bars 31 and top longitudinal bars 32 are arranged alternately at the top of the steel shell 1. In this embodiment, by arranging the internal concrete reinforcement bars, the flexural performance of the pier top can be effectively improved, the control of cracks can be strengthened, and at the same time, the integrity of the structure can be improved. Specifically, the web vertical bars 33 and web longitudinal bars 34 are arranged on the web PBL shear key 6, the bottom transverse bars 35 and bottom longitudinal bars 36 are arranged on the bottom PBL shear key 5, and the web vertical bars 33, web longitudinal bars 34, web PBL shear key 6, bottom transverse bars 35, bottom longitudinal bars 36 and bottom PBL shear key 5 form an integral body. One end of the erection bar 37 is tied to the top transverse bar 31, and the other end is tied to the bottom transverse bar 35.

[0059] Furthermore, it further includes pier connecting steel bars. The pier connecting steel bars include pier vertical connecting bars 71, pier top transverse connecting bars 72 and pier top longitudinal connecting bars 73. The pier top transverse connecting bars 72 and pier top longitudinal connecting bars 73 are tied into a horizontal grid. The pier vertical connecting bars 71 are vertically arranged along the axial direction of the installation reserved hole 12, and the pier vertical connecting bars 71 are tied into an integral body with the horizontal grid. In this embodiment, the arrangement of the pier connecting steel bars combined with the internal concrete reinforcement bars can enhance the integrity of the bridge structure.

[0060] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lightweight steel-concrete composite cap beam, characterized in that: It comprises a steel shell (1) and core-filled concrete poured in the steel shell (1), the steel shell (1) being a trough structure with an open top, and a bottom plate (11) of the steel shell (1) being provided with a reserved installation hole (12) for inserting a bridge pier (2); It also comprises a ring rib (3), wherein the ring rib (3) is arranged at the reserved installation hole (12), the bottom end of the ring rib (3) is connected to the bottom plate (11), and the top end of the ring rib (3) extends into the groove structure of the steel shell (1); It also comprises a transverse support assembly (4), the two ends of which are respectively supported on two sides of the inner wall of the steel outer shell (1).

2. The lightweight steel-concrete composite cap beam according to claim 1, characterized in that: The transverse support assembly (4) comprises a transverse support rod (41) and two oblique support rods (42), the two ends of the transverse support rod (41) are respectively supported on the inner side of the web of the steel shell (1), and the supporting position is located at the top of the inner side of the web of the steel shell (1); The two oblique support rods (42) are symmetrically arranged about the midline of the transverse support rod (41), and one end of the oblique support rod (42) is supported at the intersection of the inner side of the web of the steel shell (1) and the transverse support rod (41), and the other end of the oblique support rod (42) is supported at the midpoint of the bottom plate (11).

3. The lightweight steel-concrete composite cap beam according to claim 1, characterized in that: It also comprises a bottom plate PBL shear key (5), wherein the bottom plate PBL shear key (5) is arranged on the bottom plate (11), and the bottom plate PBL shear key (5) is arranged along the longitudinal direction of the bottom plate (11); It also comprises a bottom plate transverse stiffening rib (51), wherein the bottom plate transverse stiffening rib (51) is arranged on the bottom plate (11) perpendicular to the bottom plate PBL shear key (5).

4. The lightweight steel-concrete composite cap beam according to claim 3 is characterized in that: A plurality of bottom plate PBL shear keys (5) are evenly and equidistantly arranged on the bottom plate (11); A plurality of bottom plate transverse stiffening ribs (51) are evenly and equidistantly arranged on the bottom plate (11).

5. The lightweight steel-concrete composite cap beam according to claim 1, characterized in that: It also comprises a web PBL shear key (6), wherein a plurality of the web PBL shear keys (6) are vertically arranged on the inner side of the web of the steel shell (1), and the plurality of the web PBL shear keys (6) are evenly and equidistantly arranged; It also includes web shear nails (61) and web tension steel bars (62), wherein a plurality of the web shear nails (61) are evenly and equidistantly arranged on the inner side of the web of the steel shell (1), and the two ends of the web tension steel bars (62) are respectively connected to the shear nails (61) of the webs on both sides of the steel shell (1).

6. The lightweight steel-concrete composite cap beam according to claim 1, characterized in that: It also includes a cantilever arm (7), one side of the cantilever arm (7) is connected to the outer side of the web of the steel shell (1), and the top of the cantilever arm (7) is connected to the flange of the top plate of the steel shell (1); The cantilever arm (7) is provided with a cantilever arm circular hole (8); The other side of the cantilever arm (7) is connected to a side panel (10), and the top of the side panel (10) is connected to the flange of the top plate of the steel shell (1).

7. The lightweight steel-concrete composite cap beam according to claim 1, characterized in that: An I-beam structure (9) for supporting the bridge pier (2) is also provided at the reserved installation hole (12), the I-beam structure (9) comprising a transverse I-beam (91), a longitudinal I-beam (92) and a reinforcing channel steel (93), the transverse I-beam (91) and the longitudinal I-beam (92) being arranged perpendicular to each other, and the intersection of the transverse I-beam (91) and the longitudinal I-beam (92) is located at the center point of the reserved installation hole (12), one end of the reinforcing channel steel (93) is obliquely supported on the transverse I-beam (91), and the other end of the reinforcing channel steel (93) is obliquely supported on the longitudinal I-beam (92); The I-beam structure (9) and the cap beam are both provided with a transverse support assembly (4) at the mid-span.

8. The lightweight steel-concrete composite cap beam according to claim 3 is characterized in that: It also includes internally filled concrete reinforcement, the internally filled concrete reinforcement including top transverse reinforcement (31), top longitudinal reinforcement (32), web vertical reinforcement (33), web longitudinal reinforcement (34), bottom plate transverse reinforcement (35), bottom plate longitudinal reinforcement (36) and frame reinforcement (37), the top transverse reinforcement (31) and the top longitudinal reinforcement (32) being arranged alternately on the top of the steel shell (1); The web vertical reinforcement (33) and the web longitudinal reinforcement (34) are arranged on the web PBL shear key (6), the bottom plate transverse reinforcement (35) and the bottom plate longitudinal reinforcement (36) are arranged on the bottom plate PBL shear key (5), and the web vertical reinforcement (33), the web longitudinal reinforcement (34), the web PBL shear key (6), the bottom plate transverse reinforcement (35), the bottom plate longitudinal reinforcement (36) and the bottom plate PBL shear key (5) form a whole; One end of the frame reinforcement (37) is tied to the top transverse reinforcement (31), and the other end is tied to the bottom plate transverse reinforcement (35).

9. The lightweight steel-concrete composite cap beam according to claim 3, characterized in that: It also includes pier connecting steel bars, the pier connecting steel bars including pier vertical connecting bars (71), pier top transverse connecting bars (72) and pier top longitudinal connecting bars (73), the pier top transverse connecting bars (72) and pier top longitudinal connecting bars (73) are tied into a horizontal grid, the pier vertical connecting bars (71) are arranged vertically along the axial direction of the reserved installation holes (12), and the pier vertical connecting bars (71) and the horizontal grid are tied into a whole.

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